diff options
Diffstat (limited to 'thirdparty/nRF5_SDK_15.0.0_a53641a/external/lwip/src/netif/ppp/polarssl/arc4.c')
-rw-r--r-- | thirdparty/nRF5_SDK_15.0.0_a53641a/external/lwip/src/netif/ppp/polarssl/arc4.c | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/thirdparty/nRF5_SDK_15.0.0_a53641a/external/lwip/src/netif/ppp/polarssl/arc4.c b/thirdparty/nRF5_SDK_15.0.0_a53641a/external/lwip/src/netif/ppp/polarssl/arc4.c new file mode 100644 index 0000000..6e17ec4 --- /dev/null +++ b/thirdparty/nRF5_SDK_15.0.0_a53641a/external/lwip/src/netif/ppp/polarssl/arc4.c @@ -0,0 +1,101 @@ +/* + * An implementation of the ARCFOUR algorithm + * + * Based on XySSL: Copyright (C) 2006-2008 Christophe Devine + * + * Copyright (C) 2009 Paul Bakker <polarssl_maintainer at polarssl dot org> + * + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * * Neither the names of PolarSSL or XySSL nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED + * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR + * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF + * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING + * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ +/* + * The ARCFOUR algorithm was publicly disclosed on 94/09. + * + * http://groups.google.com/group/sci.crypt/msg/10a300c9d21afca0 + */ + +#include "netif/ppp/ppp_opts.h" +#if PPP_SUPPORT && LWIP_INCLUDED_POLARSSL_ARC4 + +#include "netif/ppp/polarssl/arc4.h" +/* + * ARC4 key schedule + */ +void arc4_setup( arc4_context *ctx, unsigned char *key, int keylen ) +{ + int i, j, k, a; + unsigned char *m; + + ctx->x = 0; + ctx->y = 0; + m = ctx->m; + + for( i = 0; i < 256; i++ ) + m[i] = (unsigned char) i; + + j = k = 0; + + for( i = 0; i < 256; i++, k++ ) + { + if( k >= keylen ) k = 0; + + a = m[i]; + j = ( j + a + key[k] ) & 0xFF; + m[i] = m[j]; + m[j] = (unsigned char) a; + } +} + +/* + * ARC4 cipher function + */ +void arc4_crypt( arc4_context *ctx, unsigned char *buf, int buflen ) +{ + int i, x, y, a, b; + unsigned char *m; + + x = ctx->x; + y = ctx->y; + m = ctx->m; + + for( i = 0; i < buflen; i++ ) + { + x = ( x + 1 ) & 0xFF; a = m[x]; + y = ( y + a ) & 0xFF; b = m[y]; + + m[x] = (unsigned char) b; + m[y] = (unsigned char) a; + + buf[i] = (unsigned char) + ( buf[i] ^ m[(unsigned char)( a + b )] ); + } + + ctx->x = x; + ctx->y = y; +} + +#endif /* PPP_SUPPORT && LWIP_INCLUDED_POLARSSL_DES */ |